Did you try the .lut file I added in my attachment. Note that my file is a raw text file. The file you uploaded is in "RichTextFormat" which is not raw text.

The raw text data looks like this:

* s=byte index red green blue
S 0 0 0 0
S 1 255 0 16
S 2 255 0 13
S 3 255 0 10
S 4 255 0 8
...

While your RTF has a lot of formatting:

{\rtf1\ansi\ansicpg1252\cocoartf2580
\cocoatextscaling0\cocoaplatform0{\fonttbl\f0\fswiss\fcharset0 Helvetica;\f1\froman\fcharset0 TimesNewRomanPSMT;}
{\colortbl;\red255\green255\blue255;\red191\green191\blue191;}
{\*\expandedcolortbl;;\csgray\c79525;}
\margl1440\margr1440\vieww11520\viewh8400\viewkind0
\deftab720

\itap1\trowd \taflags1 \trgaph108\trleft-108 \trwWidth6500\trftsWidth3 \trbrdrt\brdrnil \trbrdrl\brdrnil \trbrdrr\brdrnil
\clvertalb \clshdrawnil \clwWidth1299\clftsWidth3 \clbrdrt\brdrs\brdrw20\brdrcf2 \clbrdrl\brdrs\brdrw20\brdrcf2 \clbrdrb\brdrs\brdrw20\brdrcf2 \clbrdrr\brdrs\brdrw20\brdrcf2 \clpadl100 \clpadr100 \gaph\cellx1728
\clvertalb \clshdrawnil \clwWidth1020\clftsWidth3 \clbrdrt\brdrs\brdrw20\brdrcf2 \clbrdrl\brdrs\brdrw20\brdrcf2 \clbrdrb\brdrs\brdrw20\brdrcf2 \clbrdrr\brdrs\brdrw20\brdrcf2 \clpadl100 \clpadr100 \gaph\cellx3456
\clvertalb \clshdrawnil \clwWidth1020\clftsWidth3 \clbrdrt\brdrs\brdrw20\brdrcf2 \clbrdrl\brdrs\brdrw20\brdrcf2 \clbrdrb\brdrs\brdrw20\brdrcf2 \clbrdrr\brdrs\brdrw20\brdrcf2 \clpadl100 \clpadr100 \gaph\cellx5184
\clvertalb \clshdrawnil \clwWidth1020\clftsWidth3 \clbrdrt\brdrs\brdrw20\brdrcf2 \clbrdrl\brdrs\brdrw20\brdrcf2 \clbrdrb\brdrs\brdrw20\brdrcf2 \clbrdrr\brdrs\brdrw20\brdrcf2 \clpadl100 \clpadr100 \gaph\cellx6912
\clvertalb \clshdrawnil \clwWidth1040\clftsWidth3 \clbrdrt\brdrs\brdrw20\brdrcf2 \clbrdrl\brdrs\brdrw20\brdrcf2 \clbrdrb\brdrs\brdrw20\brdrcf2 \clbrdrr\brdrs\brdrw20\brdrcf2 \clpadl100 \clpadr100 \gaph\cellx8640
\pard\intbl\itap1\pardeftab720\ri0\partightenfactor0
\f0\fs24 \cf0 * s=byte \cell
\pard\intbl\itap1\pardeftab720\ri0\partightenfactor0
\cf0 Index
\f1\fs20 \cell
\pard\intbl\itap1\pardeftab720\ri0\partightenfactor0
...